

package com.hazelcast.spi.impl.eventservice.impl;

import com.hazelcast.internal.nio.IOUtil;
import com.hazelcast.internal.util.UUIDSerializationUtil;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import com.hazelcast.spi.impl.SpiDataSerializerHook;

import java.io.IOException;
import java.util.UUID;

/**
 * An Envelope around an event object. The envelope adds some additional metadata to the event.
 */
public final class EventEnvelope implements IdentifiedDataSerializable {

    private UUID id;
    private String serviceName;
    private Object event;

    public EventEnvelope() {
    }

    EventEnvelope(UUID id, String serviceName, Object event) {
        this.event = event;
        this.id = id;
        this.serviceName = serviceName;
    }

    public String getServiceName() {
        return serviceName;
    }

    public Object getEvent() {
        return event;
    }

    /**
     * The event ID. This corresponds to the listener registration ID.
     */
    public UUID getEventId() {
        return id;
    }

    @Override
    public int getFactoryId() {
        return SpiDataSerializerHook.F_ID;
    }

    @Override
    public int getClassId() {
        return SpiDataSerializerHook.EVENT_ENVELOPE;
    }

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
        UUIDSerializationUtil.writeUUID(out, id);
        out.writeString(serviceName);
        IOUtil.writeObject(out, event);
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
        id = UUIDSerializationUtil.readUUID(in);
        serviceName = in.readString();
        event = IOUtil.readObject(in);
    }

    @Override
    public String toString() {
        return "EventEnvelope{id='" + id + "', serviceName='" + serviceName + "', event=" + event + '}';
    }
}
